It is probably because of the Disk breaks. What they do on some cars with
rear disk brakes is there is a tiny little drum brake inside the disk hub on
my old car it was no more that 4" dia. You don't get nearly as much surface
area for braking.
This has been discussed at length on the Light Duty forum at
... search for Parking Brake
There is a TSB on the drum-in-hat parking brake for the NBS - an
updated clip assembly. The original assembly can get out of alignment,
possibly always drag and destroy the hub. The inspection stations
have said they have failed a lot of NBS GM trucks for pbrake not
Texas Legend wrote:
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